section {
  width: 400px;
  height: 400px;
  margin: 100px auto;
  border: solid 1px gray;
  position: relative;
}
section div {
  width: 100px;
  height: 100px;
  border: solid 1px gray;
  text-align: center;
}
section div:first-child {
  position: absolute;
  left: 25%;
  top: 25%;
}
section div:nth-child(2) {
  position: absolute;
  left: 50%;
  top: 25%;
}
section div:nth-child(3) {
  position: absolute;
  left: 25%;
  top: 50%;
}
section div:nth-child(4) {
  position: absolute;
  left: 50%;
  top: 50%;
}
